swap_pager.h

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/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1990 University of Utah.
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      from: @(#)swap_pager.h  7.1 (Berkeley) 12/5/90
 * $FreeBSD$
 */
 
#ifndef _VM_SWAP_PAGER_H_
#define _VM_SWAP_PAGER_H_
 
#include <sys/_types.h>
 
struct buf;
struct swdevt;
struct thread;
typedef void sw_strategy_t(struct buf *, struct swdevt *);
typedef void sw_close_t(struct thread *, struct swdevt *);
 
/*
 * Swap device table
 */
struct swdevt {
        int     sw_flags;
        int     sw_nblks;
        int     sw_used;
        dev_t   sw_dev;
        struct vnode *sw_vp;
        void    *sw_id;
        __daddr_t sw_first;
        __daddr_t sw_end;
        struct blist *sw_blist;
        TAILQ_ENTRY(swdevt)     sw_list;
        sw_strategy_t           *sw_strategy;
        sw_close_t              *sw_close;
};
 
#define SW_UNMAPPED     0x01
#define SW_CLOSING      0x04
 
#ifdef _KERNEL
 
extern int swap_pager_avail;
extern int nsw_cluster_max;
 
struct xswdev;
int swap_dev_info(int name, struct xswdev *xs, char *devname, size_t len);
void swap_pager_copy(vm_object_t, vm_object_t, vm_pindex_t, int);
vm_pindex_t swap_pager_find_least(vm_object_t object, vm_pindex_t pindex);
void swap_pager_swap_init(void);
int swap_pager_nswapdev(void);
int swap_pager_reserve(vm_object_t, vm_pindex_t, vm_pindex_t);
void swap_pager_status(int *total, int *used);
u_long swap_pager_swapped_pages(vm_object_t object);
void swapoff_all(void);
bool swap_pager_init_object(vm_object_t object, void *handle,
    struct ucred *cred, vm_ooffset_t size, vm_ooffset_t offset);
#endif                          /* _KERNEL */
#endif                          /* _VM_SWAP_PAGER_H_ */